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GRAPEVINE (CBSDFW.COM) – A Grapevine-Colleyville ISD spokeswoman confirmed a case of Hepatitis A at Cross Timbers Middle School on Tuesday but a Tarrant County public health specialist says the individual is not infectious.

Grapevine-Colleyville Independent School District spokeswoman Megan Overman said there was just one case at the middle school. She did not release any details about the person’s identity.

Vanessa Joseph, spokeswoman for Tarrant County’s Public Health Department, said the individual was vaccinated and “close contacts also vaccinated.” She said the potential of other cases “is minimal.”

“Realizing that vaccination is not foolproof, we are now in the mode of providing prevention education,” Joseph wrote in an email.

The Public Health Department helps in prevention efforts, she added, saying “if an individual is symptomatic they would need to see their physician.”

The county averages between 18 and 25 new cases of Hepatitis A annually, Joseph said.

According to the National Library of Medicine, Hepatitis A is a viral infection of the liver that occurs when an individual consumes or comes into contact with the stool of a carrier. Commonly these include fruits, vegetables, shellfish, ice and water.

Symptoms usually show up two to six weeks after exposure and include dark urine, fatigue, itching, appetite loss, nausea and yellow skin.

More than 85 percent of sufferers recover within three months. The infection deserts nearly all victims within six months.

There are about 3,600 cases of Hepatitis A reported each year, the National Library of Medicine says.